Improvement in gin-saw sharpeners



UNITED STATES PATENT CEEICE.

JOSIAH MIZELL AND JOHN REVELL, OF OOLERAIN, NORTH CAROLINA.

IMPROVEMENT IN GlN-SAW SHARPENERS.

Specification forming part of Letters Patent No. 158,964, dated January19, 1875; application tiled October 14, 1874.

Figure l is a side, and Fig. 2 a front, eleva# tion. Fig. 3 is a sideview of Sharpener with cross-section of its shaft.

The invention relates to machines for sharpening teeth ofa series ofcircular gin-saws arranged upon the same shaft, the invention in thisinstance being directed to the feed of the rotary iile from one tooth toanother, the adaptation of the same machine to saws of differentdiameter, the mode of holding the saw that is being filed steadilycentered between the legs, and the mode of relativelyr placing the legsso as to enable the machine to rest upon the spacing-blocks between thesaws more conveniently and securely. A represents a series of gin-sawsarrange upon a common shaft, B, and spaced by the annular blocks C. D isa bar having grooves d l at the end, and pivoted to a lug, e, of themain frame E, which latter has' grooves el el and arc-bar e2. On thelatter the bar D is adjusted and held by a clamp-screw toregulate theObliquity of the shaft G and rotary le H with respectto the saw. Throughthe frame E passes the rotary tile-shaft G having.`

the hand-crank J by which it is turned.

Thus far all is old, having been heretofore disclosed to the public in apatent granted to J. McBride, July 2,1872.

First, we regulate the feed of tool H successively to the several teethby giving the ile-shaft G longitudinal play in the frame,

holding it out at one end by a spring, K, whose forks enter the annulargroove g, and by drawing it in against the spring by a screw, L, and camL on a plate, or the end of frame E. This movement is to a distanceequal to that between the roots of two teeth7 causes the saw to be movedcorrespondingly, or to the same distance, and allows the spring to throwthe file and its shaft forward over an unled space between two teeth. Inorder that the rotary le may be in a position to pass over and clear theintervening tooth,

we cut it away and dam at the point h. We may use other means than thespring for throwing the shaft and file forward, and instead of the screwL for drawing them back, but these are at present believed by us to bgreatly preferable.

Second, we adapt the same lingmachine to saws ot' different diameter, orhaving a different distance between the circumference of saw and that ofspacing-blocks, by making long slots m in the legs M M, and slots in thelegs N N, which are made separate in pairs, or jointed together at thetop. By clamping them at dii'erent adjustments with the screws m u', themachine becomes equally well adapted to all sizes of gin-saws.

rlhird, we make the bar D so long that the legs M and N will be thrownupon opposite sides of the center of saw, so as to counterpoise eachother, and thus make the machine sit much more steadily and securely.

Fourth, we cause the legs to properly center the saw which is to benled, by the spacing-sprin gs O, which readily adapt themselves to thevarying distance between saws on different shafts.

Having thus described our invention, what we claim as new is- 1. Thecombination, with file-sh aft G, having longitudinal play, of thecircular file H, cut away at h, as shown and described, to allow thetile to be drawn back and thrown forward at the times and in the mannerspecified.

2. The combination, with file-shaft Gr, having longitudinal play, of thecam L', screw L, and spring K, as and for the purpose specified.

3. The combination, with the bar D, and frame E, having grooved guides,of slotted legs and clamp-screws, to adapt the -machine to saws havingteeth at greater or less distance from the spacing-blocks.

4. The combination, with bar D, of legs M land N, placed, respectively,upon dilferent sides of saw-shaft, as and for the purpose set forth.

5. The combination, with legs, of spacingsprings O, to bear against theadjacent saws, in the manner specified.

JOSIAH MIZELL. JOHN REVELL. Witnesses:

J oHN WILSON, W. B. ALEXANDER.

